回學校後不能上傳資料

C:\Users\MD-500\Downloads\PM250722\pm2.5new\Arduino蝔?K\1050513\LED4_Buzzer_DHT22_ESP8266_Relay_air1_sample\LED4_Buzzer_DHT22_ESP8266_Relay_air1_sample.ino:2:17: fatal error: DHT.h: No such file or directory

compilation terminated.

exit status 1Error compiling for board Arduino/Genuino Uno.

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